Related Articles

Sources

Miniature VCXOs The CFPV-41/42/43/44 series miniature surface-mount voltage-controlled crystal oscillators (VCXO) are designed for SONET/SDH transmission systems in local telephone exchanges and local or wide area networks. The oscillators offer a high degree of frequency pulling (control of the output frequency via an applied voltage), thereby allowing degraded incoming signals to be corrected to nominal frequency via a phase-locked loop. Frequency pulling is up to ±50 ppm (CFPV 41/42) and up to ±100 ppm (CFPV 43/44). The VCXOs operate over a temperature range of -10° to +70°C at any output frequency between 1.0 and 52 MHz, including the standard fixed-line telecommunication frequencies at 8.192, 10 and 38.88 MHz. Price: from $3.50 to $11.30. C-MAC Frequency Products, Durham, NC (919) 941-0430.

Subminiature TCXO The model 312BE subminiature temperature-compensated crystal oscillator (TCXO) has a frequency range of 12,600 to 19,800 MHz. Frequency tolerance is -0.5 to +0.5 ppm at 25°C and frequency stability is -2.5 to +2.5 ppm over an operating temperature range of -20° to +75°C. Designed for surface-mount applications, the TCXO has low profile packaging with a ceramic base and a metal cover and measures 7 mm x 5 mm x 2 mm. The unit requires a supply voltage of between +2.85 and +3.15 V and input current is 2.0 mA (max). Storage temperature range is -40° to +80°C. Price: $8 (1000). Delivery: eight to 10 weeks (ARO). Fox Electronics, Fort Myers, FL (888) 438-2369.

Voltage-controlled Ovenized Crystal Oscillators The K2000 series voltage-controlled ovenized crystal oscillators (VCOCXO) are designed specifically for Stratum 3 timing and synchronization applications. Housed in a compact, hermetically sealed DIL 14 package, the VCOCXOs operate with +5 or +12 V DC power supply voltages. With a +12 V supply, frequency stability is less than ±100 ppb over the temperature range of 0° to 70°C. Overall frequency stability including temperature, voltage, load and aging is less than ±370 ppb/day. Phase noise is less than -95 dBc/Hz at 10 Hz and voltage control (pull-in/hold-in) function is greater than ±10 ppm with deviation linearity less than 10 percent. Standard frequencies are available up to 20 MHz with optional frequencies up to 38.88 MHz. Price: starting at $75 (1000). Champion Technologies Inc., Franklin Park, IL (800) 888-1499.

Commercial Wideband VCO The model VCO190-1500BT generates frequencies from 1000 to 2000 MHz with control voltages from 0.5 to 20 V. The unit typically requires 23 mA of current from a supply voltage of 8 V. Phase noise is -94 dBc/Hz at 10 kHz offset (typ), output power is +6 dBm (typ), and typical second and third harmonic suppression is -20 and -30 dBc, respectively. Housed in a surface-mount, pick-and-place reflow-compatible package, the unit measures 0.50" x 0.50" x 0.18". Vari-L Company Inc., Denver, CO (303) 371-1560.

100 - 800 MHz VCXOs The M303 series VCXOs have expanded to include frequencies from 100 to 800 MHz. Originally designed for SONET applications, these high performance VCXOs are well suited for high speed computing or telecommunications applications as well as network computing, base stations, high end servers, data communications transmission and automatic test equipment. A standard device provides temperature stability of less than 30 ppm over an operating temperature range of 0° to 70°C. Delivery: stock to 12 weeks (ARO). Micro Networks/Andersen Laboratories, Worcester, MA (508) 852-5400.

Post a comment to this article

Name*

E-mail(will not be displayed)*

Subject

Comment*

Report Abusive Comment

Thank you for helping us to improve our forums. Is this comment offensive? Please tell us why.